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Science 16 October 1959:
Vol. 130. no. 3381, pp. 976 - 977
DOI: 10.1126/science.130.3381.976
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Articles

Measurement of Human Heart Rate during Usual Activty

DONALD A. ROWLEY 1, SEYMOUR GLAGOV 1, and PETER STONER 1

1 Department of Pathology, University of Chicago, Chicago, Illinois

A small, rugged, self-contained cumulative heart-beat counter has a transistorized amplifier, a watch movement made into a counter, and a battery. The counter is activated by each R-wave of the electrocardiographic complex obtained from newly designed precordial electrodes. Heart beats can be counted for as long as 24 hours.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)